Abisko Aurora Sky Station

12 Feb 2013 · 55mm · f/3.5 · 30 s · ISO 3200

“In the northwest of Sweden, at 900 metres on Mount Nuolja. Even when the surroundings are cloudy, the top is mostly clear.”

Settings decoded

f/3.5A middle aperture — light vs. sharpness.

30sA long exposure — smooths motion into soft bands.

ISO 3200Pushed high — grain is the trade for a fast, dim subject.

55mmA tighter frame.

That night, in the Kp archive

Kp 1.67in the 3-hour slot of the frame · day’s max Kp 2.67

GFZ archive, 3-hour value — the Kp of a frame made at this place and time.

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